Head lamp



llg. 16, 1932. A, R LEWELLEN 1,871,801

HEAD LAMP Filed Jan. 16, 1930 Patented Aug. 16, 1932 ALBERT R. LEWELLE'N, OE DETROIT PORATION, OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE 11min) LAMP i Appueatitn aleaJanaary 16,1930; seriall N0.421,176.

It is the object of this invention to provide a head-lamp organization with simple, inexpensive and reliable means for centering and securing the main parts thereofV in assembled relationship; and preferred embodiments of the invention may involve the use, within an external plate-retaining rimA element, which may be C-shaped in radial sect-ion, of a tension band that serves to retain said rim by constrictive engagement with parts interior thereto.

The invention preferably includes eX- ternally accessible means for so tensioning said band as to bring a flange or bead thereon into a resilient retaining engagement with a cooperating part upon one of the main concave elements of the head-lamp; and said concave elements preferably include not only mutually engaging integral flanges, disposedy at an angle to one another, but also integral extensions, disposed at right angles to one another, upon said flangesV-the flanges and/or extensions serving tocentre the mentioned parts and also to effect a bayonet# joint interconnection therebetween.

This invention, in some embodiments thereof, contemplates the use of strip stock in the production of said rim. It also contemplates the use of a novel inwardly-extending interlocking element or Y elements, preferably hook-like in form, interiorly-and perma-j nently secured to said rim; anch-if desired,

Y one of the elements last referredto may include a plate which serves to unite the ends of said strip stock to form'said rim-,i-incidentally providing an opening for the recep# tion of angle elements,or the like, if provided upon or secured to the ends of the mentioned band, to receive a suitable tensioningscrew, Other objects of this inventionmay be best appreciated from the followingdescription of illustrative embodiments thereof,-taken in connection with the appended claims Aand the accompanying drawingz i Y- Figure 1 is a front elevational: -`vie`w,- serving to show-how Figures 2 and 3 are taken. Figure 2 is a substantially radial detail view, taken somewhat. as suggested by ,the line 2--2-Vof Figure l, .but on a largerscale.

Vtionship.

Figure 3 is a view comparable with F ig# ure 21b'ut takenfsubstantially as indicated -by the line Sip-3 of Figure 1.V i

Figure 4 is a detail sectional view-, with "a slight perspective effect, taken substantially as indicatedby the line 4-'4 ofV Figui-e3. f' f Figure 5 is a side elevational view, taken substantially asindicated `by the arrow 5 of Figure 1, with parts broken away to La substantially median plane,-"-some features of modification being suggested inthis fig ure. l l 1 Referring first to conventional features included in the illustrated embodiment, a main concave shell element 11 is shown as interiorily receiving a concave reflecting element y12,-the latter being so spaced from the former as'to provide for the positioning of socket elements 13, 1 4 and 15 with twinwire conductive elements 16,17 and 18there-l between; an annular `rim 19 is shown as including anvinwardly extending and slightly resilient flange 2O for the .retention y'of a light-transmitting plate 21, of any pre` ferred character, and as engaging the outer concave element 11; and the'entire organi# cation :referred tomay be supported lby means 'such as ausual bracket 22,--retaining the headfof a screw 23 in such mannery as to permit adjustment of the headlampitoi'any desired position relatively to some substantial structural element, not shown.` The con-- cave reflecting.element 12 is shownas 'pro-f vided, nearthe periphery thereof, with an annular bead 24, disposed favorably toengagementbyv a felt or other gasket o'rfcusheV ionin g element 25,against which a iiange 26 on the plate21 is pressed by the mentioned flange 20; andthe present invention relates, as indicated above, more particularly to eX pedients .for centeringand retaining Sthe mentioned parts inztheirxassembled relafv Adjacent tothe vmentioned.lbeadY 24, the innerconcav'erelement 12ris shown as prof vided :with t a substantially lcylindrical l rear-f PATENT oFrIcEz- MICHIGAN, ViAssIernORTo GENERAL MOTORS.A cOR- ci:

wardlybentlange27, seatedfagainst a sub-YY Y Y stantially lat and inwardly bent fiiange'28,

provided upon the outer concave element 11.

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Y .with a substantially cylindrical extension 29,

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with which the mentioned cylindrical flange 27 is in external engagement; and the lastmentioned flange may advantageously be provided with a flat radial extension 30, lying substantially parallel with the mentioned flange-28. f f

To assure inwardly application of pres-v sure through mentioned parts including the conical flange 20, andA to provide'for the retention of the rim'19 ina preferred position, the latter may interiorly receive a tension band 31. This is shown as shaped to 'interfit between the gasket-25 and an additional flange 32,-provided upon the rim 19 adjacent onenofa plurality of beads 33 and 34, peripherally .formed upon theouter concave element 11. The tension band 31 is shown as provided v with abead 35, intermediate the width thereof,adapted,to so engage the mentioned bead 34, upon constriction of-vsaid band, las to hold the rim 19 in its illustrated position; and tensionrmay be applied to said band by means of a screw 36...; This screwV is shown as extending through openings in apairof brackets 37, 37 secured to terminal portions of the band 31, and extending through an opening in the rim 19; and, for an interlocking effect, preventing undesired relative rotation of mentioned parts, the respectivel flanges 26 and 28, and also the extension 30 upon flange 27, may be provided with suitable coincident openings-'such as slots 38, 38 and shown in thel flanges 26 and 28; and an interlocking '-eifectmay then be obtained by the insertion therethroughfof a pin or al suitable hooklikeor inwardly curved element 39. This may be secured to the rim 19, as by means of rivets40; anda plate-like portion of the element 39, through which the mentioned rivets extend, may serve to unite the ends of the rim` 19, if the latter` is formed from strip stock, andalsoV to provide an opening 41, thrughwhich the brackets 37, 37 may'exten.-' 'f Although the foregoing clamping arrangement serves to hold the Vreflector 12 to the shell 11, it is desirable in some instances to provide an additional means to positively secure the Vreflector and shell together. For

this purpose, the flange 27 may, for example,

be providednot only withthe mentioned flat or radial stop extension 30'but with additionalfintegral extensions in the form of cam hooks 42,-shown as disposed in the plane offlange 27 and adaptedVV (as may best be seen in Figures 3 and 4) to effect av bayonet-joint V Vconnection between mentioned flanges by enteringthrough 'suitable slots or openings/43m iiange 28,'-eifecting an interior engagement thereof upon a slight rela-- vmerous additional modifications momentarily"bent'loutward, along a line such as that suggested at 48,-during the insertionzof said plug'and the positioning of said projection,-this construction being such as to obviate risk of subsequent accidental separation of theY relatively inaccessible parts referred to.

Figure 5 assuming the rim 19a to 'have been seamlessly formed from sheet. stock, shows an vinterlocking element 39a as including no connection plate; vand the cross-sectional outlines of terminal elements 37 a, 37a of band31acorrespond withthe usage of an early embodiment of thek present invention. A bulb 49, replaceably secured in socket 14, may include two filaments 50 and 50',- the former being at or very near a focus of the reliector 12, which may be almost parabolic; and a bulb 51, very eccentrically positioned, may be of a comparatively low candle power suitable to a parking light. will, however, beY understood that the last mentioned features, herein referred to for the sake of completeness, are but remotely related to the centering and. securing devices to Whose protection the present application is primarily directed.

In assembling, it will be obvious that,sock ets 13,14 and 15 being first securedy in the respective concave elements, the'wired `plug 13 is to be seated in socket 13 before the flanges 27 and 28 of concave elements 11 and 12 are brought into mutual engagement and the hooks 42 are seated by the slight rotative movement referred to. The plate 21, -gasket 25 and band 31 (or band 31a) may be separately assembled within the rim 19 (or 19a) in such manner as to permit separate storage, shipment, sale and application or removal thereof as a unitary sub-assembly; and, when assembly may be secured in place by merely tightening the screw 36, or-ts equivalent.

f Although the Vforegoing description has includedgspecific embodiments of the present invention, it should be understood not only that various features of this invention might be independently employed but also that'nuthereof might easily be devised by workers familiar with Y the foregoing-'all without the slightest departure from? the scope of `the present invention. I'claim:V

1. In a headlamp, a'concave outer shell, av

concave reiiector therein, and a light-trans- 'lil 0 Yapplied in the indicated manner, this subinitting plate, means for holding said shell, reflector and plate in mutual engagement comprising a hollow rim engaging said plate and a tension band within said rim constrictively engaging said shell and rim, additional means for positioning and securing said reflector to said shell comprising interlit-ting flanges thereon having a bayonetjoint connection, and means to prevent relative rotation between said shell, reflector and plate comprising an element carried by said Y rim and interengaging between said plate and interiitting flanges.

2. In a headlamp, a concave outer shell, a concave reflector therein, and a light-transmitting plate, means for positioning said reflector relative to said shell comprising interfitting flanges thereon, means for holding said plate, reflector and shell in mutual engagement comprising a hollow rim including a flange engaging said plate, a contractible band therein engaging said shell and said rim with externally accessible means to contract said band, and means for preventing relative rotation between said plate, re-

flector and shell comprising a notch in said v plate and openings in said interfitting flanges, and an element on said rim extending through said notch and openings.

3. In a headlamp, a concave outer shell, a reector therein, a light-transmitting plate, positioning means for said shell and reflector comprising interlitting flanges thereon, and holding means for said shell, reflector and plate including a split hollow rim and a contractible tension band therein, and means to unite the adjacent ends of said split rim andk prevent relative rotation between said shell, reflector and plate, comprising an element connected to said adjacent rim ends having a portion thereof engaging said plate and said interlitting flanges on said shell and reflector.

In testimony whereof I aliix my signature.

ALBERT R. LEWELLEN. 

